Sir Keir Starmer is battling to contain fresh political pressure over the handling of the Peter Mandelson appointment, as senior officials and former aides give evidence that could intensify scrutiny of his leadership.
Evidence submitted by senior figures — including former top Foreign Office official Sir Philip and the Prime Minister’s former chief of staff Morgan McSweeney — has raised further questions about the vetting process for the role, potentially complicating Sir Keir’s position ahead of a key parliamentary confrontation.
The Prime Minister is facing a motion to refer him to the Commons Privileges Committee over allegations he misled Parliament about how the appointment was handled — a move widely seen in Westminster as politically charged and potentially consequential.
Allies of Sir Keir have mounted a coordinated effort to secure backing from Labour MPs, with former prime minister Gordon Brown urging the party to rally behind him and resist what he described as an attempt to destabilise the Government.
At a meeting of the Parliamentary Labour Party, Sir Keir told MPs they must “stand together”, arguing that unity was essential in the face of what he characterised as an opposition “stunt” designed to inflict damage ahead of the local elections.
He sought to frame the motion as a politically motivated attempt to repeat the circumstances that ultimately ended the premiership of Sir Boris Johnson.
Earlier, Sir Philip told the Foreign Affairs Committee that Dame Karen Pierce, the previous UK ambassador to Washington, had been “blindsided” by the timing of Lord Mandelson’s appointment, adding that senior figures in Donald Trump’s orbit had reacted negatively to its abrupt announcement.
He said there was evidence that allies of the US president-elect felt caught off guard, while acknowledging that Ms Pierce and her team had worked effectively to build relationships at a sensitive diplomatic moment.
The comments add to a growing sense of unease within parts of Westminster about the handling of the appointment and its diplomatic ramifications.
Meanwhile, Labour whips are understood to be working intensively to prevent a backbench rebellion ahead of Tuesday’s vote, after Commons Speaker Sir Lindsay Hoyle allowed the motion to proceed following pressure from opposition MPs, including Conservative leader Kemi Badenoch.
With tensions rising and party discipline being tested, the episode has become a fresh flashpoint in an already volatile political environment — and a further test of Sir Keir’s authority at the top of Government.
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